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Tijmen
As a starting point for experimentation, I use tyre pressure/bar = 1.3 × vehicle mass/kg ÷ tyre width/mm
For the above case of a 55kg rider and assuming a light unloaded 7kg bike and 28C GP4000s blowing up to 32mm on the wider rims,
1.3×62/32=2.5
You then adjust for front/rear balance and for tyre construction and personal preference for ride and handling and maybe for compromise between comfort and efficiency in some circumstances. As I said, it's just a way of picking a starting point, and it's only for bicycles with tyres of essentially circular cross section and very high casing compliance.